JP2005132863A - Melamine resin molding material for tableware and tableware made of melamine resin and composed of the same molding material - Google Patents

Melamine resin molding material for tableware and tableware made of melamine resin and composed of the same molding material Download PDF

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JP2005132863A
JP2005132863A JP2003367259A JP2003367259A JP2005132863A JP 2005132863 A JP2005132863 A JP 2005132863A JP 2003367259 A JP2003367259 A JP 2003367259A JP 2003367259 A JP2003367259 A JP 2003367259A JP 2005132863 A JP2005132863 A JP 2005132863A
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melamine resin
molding material
mass
tableware
melamine
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Shin Sawano
伸 沢野
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Panasonic Electric Works Co Ltd
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Matsushita Electric Works Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide tableware made of a melamine resin which is composed of a molded product of the melamine resin having excellent heat discoloration resistance, especially in a light-colored molded product even when heated by a heated-air heating method. <P>SOLUTION: The melamine resin molding material for the tableware comprises the melamine resin and titanium oxide within the range of 2.5-13 mass% and barium sulfate within the range of 8-50 mass% in 9-53 mass% of a contained inorganic filler. Furthermore, the molding material preferably comprises cured product powder of the melamine resin and powder of PET resin within the range of 9-40 mass%. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、メラミン樹脂成形材料に関し、特に耐熱変色性に優れたメラミン樹脂成形品であるメラミン樹脂製食器を作製できる成形材料と食器に関するものである。   TECHNICAL FIELD The present invention relates to a melamine resin molding material, and more particularly to a molding material and tableware capable of producing a melamine resin tableware which is a melamine resin molded product excellent in heat discoloration.

従来、メラミン樹脂成形材料は、充填材として主にパルプ基材が配合されている。このため着色の自由度が高く、様々な色調に対応できるという利点により、食器、雑貨、配線器具などにおいて、塗装をせずに使用する用途などに幅広く使用されている。特に、メラミン樹脂成形品は、硬度が大きく、耐水性、耐煮沸性、耐薬品性などに優れており食器用として好適に用いられている。
しかしながら、靭性に乏しいため金属部品がインサートされた成形品ではクラックが生じる問題があり、熱可塑性樹脂であるポリエチレンテレフタレート(PET)を配合することで解決したことが先行技術として特開昭63−170453号公報に記載され、酸化チタン1.3質量%配合の実施例も記載されている。また、絶縁劣化を防ぐ目的で抑制イオン捕捉剤を含有したメラミン樹脂成形材料の配合において、ガラス繊維27.2〜29質量%、硫酸バリウム4.5〜4.8質量%、酸化チタン0.18〜0.19質量%が特開平7−41644号公報開示されている。また、特開2003−246912号公報には、電子レンジ加熱で変色が生じない食器用のメラミン樹脂成形材料において、硫酸バリウム29.1〜44.5質量%、PET樹脂粉砕品24.3〜29質量%、ガラス繊維6.8質量%の配合が記載されている。
特開昭63−170453号公報 特開平7−41644号公報 特開2003−246912号公報
Conventionally, a melamine resin molding material is mainly blended with a pulp base material as a filler. For this reason, it is widely used for tableware, miscellaneous goods, wiring utensils, and the like that are used without painting because of the advantages of high degree of freedom in coloring and compatibility with various color tones. In particular, melamine resin molded articles have high hardness and are excellent in water resistance, boiling resistance, chemical resistance, and the like, and are suitably used for tableware.
However, there is a problem that a molded product in which a metal part is inserted due to lack of toughness, there is a problem that cracks occur. And an example containing 1.3% by mass of titanium oxide is also described. Moreover, in the blending of the melamine resin molding material containing the inhibitory ion scavenger for the purpose of preventing the insulation deterioration, 27.2 to 29% by mass of glass fiber, 4.5 to 4.8% by mass of barium sulfate, 0.18 of titanium oxide. ˜0.19 mass% is disclosed in JP-A-7-41644. Japanese Patent Application Laid-Open No. 2003-246912 discloses a melamine resin molding material for tableware that does not discolor by heating in a microwave oven, 29.1 to 44.5% by mass of barium sulfate, and 24.3 to 29 of a pulverized PET resin. The blending of mass% and glass fiber 6.8 mass% is described.
JP 63-170453 JP JP 7-41644 JP JP 2003-246912 A

しかし、最近盛り付けされた食器を温風加熱方式で加熱保温し、温かい食事ができるようなシステム(適温配膳システム)が、拡大してきている。この場合、黒系統の濃色系では特に問題にならないが、この他の淡色系のメラミン樹脂製食器においては、変色が著しいと言う課題を有していた。   However, a system (appropriate temperature distribution system) that can heat and keep warmly-heated dishes that have been recently arranged using a hot air heating method has been expanding. In this case, there is no particular problem in the black dark color system, but the other light-colored melamine resin tableware has a problem that the discoloration is remarkable.

本発明は上記の点に鑑みて為されたものであり、淡色系において、耐熱変色性に優れたメラミン樹脂成形品でなる食器を得ることのできる食器用メラミン樹脂成形材料を提供することを目的とするものである。   The present invention has been made in view of the above points, and an object of the present invention is to provide a melamine resin molding material for tableware that can obtain tableware made of a melamine resin molded product having excellent heat discoloration resistance in a light color system. It is what.

請求項1に係る本発明のメラミン樹脂成形材料は、メラミン樹脂成形材料において含有する無機充填材が9〜53質量%でありこの内、酸化チタン2.5〜13質量%、及び硫酸バリウム8〜50質量%を含むものである。   In the melamine resin molding material of the present invention according to claim 1, the inorganic filler contained in the melamine resin molding material is 9 to 53% by mass, of which 2.5 to 13% by mass of titanium oxide, and 8 to 8% of barium sulfate. It contains 50% by mass.

また、請求項2に係る本発明のメラミン樹脂成形材料は、メラミン樹脂硬化物粉末及び又はPET樹脂粉末が9〜40質量%の範囲で含有されるのが好ましいとするものである。   In addition, the melamine resin molding material of the present invention according to claim 2 preferably contains melamine resin cured product powder and / or PET resin powder in a range of 9 to 40% by mass.

さらに、請求項3に係る本発明のメラミン樹脂成形材料は、ガラス繊維を4〜10質量%含有することが好ましいとするものである。   Furthermore, the melamine resin molding material of the present invention according to claim 3 preferably contains 4 to 10% by mass of glass fiber.

また、請求項4は、請求項1乃至3いずれかの食器用メラミン樹脂成形材料で成形加工してなるメラミン樹脂製食器である。   A fourth aspect of the present invention is a melamine resin tableware obtained by molding the melamine resin molding material for tableware according to any one of the first to third aspects.

請求項1に係る本発明の食器用メラミン樹脂成形材料により、耐熱変色性に優れたメラミン樹脂成形品であるメラミン樹脂製食器を得ることができる。
請求項2に係る本発明の食器用メラミン樹脂成形材料により、その成形品であるメラミン樹脂製食器の軽量化が図れるものである。さらに、請求項3に係る本発明によりメラミン樹脂製食器の強度向上が図れるものである。
With the melamine resin molding material for tableware of the present invention according to claim 1, melamine resin tableware which is a melamine resin molded product having excellent heat discoloration property can be obtained.
The melamine resin molding material for tableware of the present invention according to claim 2 can reduce the weight of the molded product melamine resin tableware. Furthermore, the strength of the melamine resin tableware can be improved by the present invention according to claim 3.

本発明に係る食器用メラミン樹脂成形材料は、メラミン樹脂に無機充填材の内、酸化チタンと硫酸バリウムを必須成分として含有するものである。   The melamine resin molding material for tableware which concerns on this invention contains a titanium oxide and barium sulfate as an essential component in a melamine resin among inorganic fillers.

メラミン樹脂としては、メチロール化メラミン、メチロール化メラミン−フェノール共縮合樹脂、メチロール化メラミン−ユリア共縮合樹脂、メチロール化メラミン−エポキシ共縮合樹脂などのような、トリアジン類とホルムアルデヒド類との付加共縮合により得られる合成樹脂を挙げることができる。   Melamine resins include methylolated melamine, methylolated melamine-phenol cocondensation resin, methylolated melamine-urea cocondensation resin, and methylolated melamine-epoxy cocondensation resin. The synthetic resin obtained by can be mentioned.

本発明では無機充填材を用いるが、この無機充填材は、メラミン樹脂成形材料において、9〜53質量%の範囲で配合されることを必須としその内、酸化チタンが2.5〜13質量%、及び硫酸バリウムが8〜50質量%を含むものであり、これ以外に併せて用いることができる無機充填材として炭酸カルシウム、水酸化アルミニウム、タルク、クレー、溶融シリカ、結晶シリカ、ケイ酸ジルコニウム、アルミナ、酸化ジルコニウム等が挙げられる。   In the present invention, an inorganic filler is used, and this inorganic filler is required to be blended in the range of 9 to 53 mass% in the melamine resin molding material, and among them, titanium oxide is 2.5 to 13 mass%. , And barium sulfate containing 8 to 50% by mass, and other inorganic fillers that can be used in combination are calcium carbonate, aluminum hydroxide, talc, clay, fused silica, crystalline silica, zirconium silicate, Examples thereof include alumina and zirconium oxide.

また、メラミン樹脂硬化物粉末又は及び、PET樹脂粉末を9〜40質量%用いることができる。メラミン樹脂硬化物粉末は、メラミン固形樹脂を乾燥機などにて加熱し硬化させて得られた硬化物を粉砕することや又メラミン樹脂成形材料の成形品や成形時に発生するランナー、スプール、成形バリを粉砕することで調製することができる。PET樹脂粉末はPET樹脂を生産時に直接粉末状で得ることもできるが、一旦粒上で得たものを改めて粉砕することで調製することができる。これらを配合すると、増量効果とともに、無機充填材に比べ比重を小さくすることができる。また、メラミン樹脂硬化物粉末の場合は、バインダー樹脂としてのメラミン樹脂との密着性に優れるので特に耐汚染性に優れた効果を発揮する。PET樹脂の場合、低収縮化の効果を奏する。いずれも、9質量%以下では、これらの効果がほとんどなく、40質量%を越えると成形材料としての流動性を悪くするので好ましくない。   Moreover, 9-40 mass% of melamine resin hardened | cured material powder or PET resin powder can be used. Melamine resin cured product powders are obtained by crushing a cured product obtained by heating and curing a melamine solid resin with a dryer or the like, or molding products of melamine resin molding materials, runners, spools, molding burrs generated during molding. Can be prepared by grinding. The PET resin powder can be directly obtained in the form of a PET resin at the time of production, but can be prepared by once again pulverizing what was obtained on the grains. When these are mix | blended, specific gravity can be made small with an increase effect compared with an inorganic filler. Moreover, in the case of melamine resin cured product powder, since it is excellent in adhesiveness with the melamine resin as binder resin, the effect especially excellent in stain resistance is exhibited. In the case of PET resin, the effect of reducing shrinkage is exhibited. In any case, if it is 9% by mass or less, these effects are hardly obtained, and if it exceeds 40% by mass, the fluidity as a molding material is deteriorated.

さらに、ガラス繊維を4〜10質量%用いることができる。ガラス繊維が4質量%未満では、強度向上がほとんど認められず、10質量%を越えると成形材料としての流動性や成形品の外観を悪くするので好ましくない。   Furthermore, 4-10 mass% of glass fibers can be used. If the glass fiber is less than 4% by mass, the strength is hardly improved, and if it exceeds 10% by mass, the fluidity as the molding material and the appearance of the molded product are deteriorated.

これらメラミン樹脂成形材料全量に対して、シランカップリング剤を0.1〜1質量%用いることができる。このシランカップリング剤の配合によってメラミン樹脂と充填材との密着性が良好になり、成形品の強度を高めることができる。同時に、界面強度が大きくなるので耐汚染性も向上する。シランカップリング剤としては、アミノシランやエポキシシランなどを用いることができる。なお、シランカップリング剤の含有量が0.1質量%未満では、含有成分同士間の密着性を向上することができない恐れがあり、1質量%を超える場合には、上記密着性向上の効果が頭打ちになる。   The silane coupling agent can be used in an amount of 0.1 to 1% by mass based on the total amount of these melamine resin molding materials. By blending this silane coupling agent, the adhesion between the melamine resin and the filler is improved, and the strength of the molded product can be increased. At the same time, since the interface strength is increased, the contamination resistance is also improved. As the silane coupling agent, aminosilane, epoxysilane, or the like can be used. In addition, when content of a silane coupling agent is less than 0.1 mass%, there exists a possibility that the adhesiveness between containing components cannot be improved, and when exceeding 1 mass%, the effect of the said adhesive improvement is carried out. Becomes a peak.

さらに、本発明においては、硬化剤として無水フタル酸、パラトルエンスルフォン酸、ステアリン酸などを、離型剤としてステアリン酸アマイド、ステアリン酸亜鉛、ステアリン酸マグネシウム、ステアリン酸、モンタン酸、カルボキシル基含有ポリオレフィンなどを、着色剤としては、コバルトアルミネートブルー、ベンガラ、亜鉛華、カーボンブラックなどを挙げることができる。さらに、必要に応じて可塑剤などを用いることもできる。   Further, in the present invention, phthalic anhydride, p-toluenesulfonic acid, stearic acid and the like as the curing agent, stearic acid amide, zinc stearate, magnesium stearate, stearic acid, montanic acid, carboxyl group-containing polyolefin as the release agent Examples of the colorant include cobalt aluminate blue, bengara, zinc white, and carbon black. Furthermore, a plasticizer etc. can also be used as needed.

上記のような成分を用いたメラミン樹脂成形材料の調製方法の一例を示す。
成形材料を得るにあたっては、まず、メラミン樹脂乾燥品は、次の様にして調製した。メラミンに対するホルムアルデヒドのモル比1.2〜3で、アルカリ触媒下、反応温度65〜98℃、反応時間15〜120分で反応させることで、メラミン樹脂シラップを得、このメラミン樹脂シラップをニーダーに移し、攪拌しながらシートパルプ、シート状ケナフ、粉末ケナフ、綿粉、ガラス繊維、合成樹脂繊維などや離型剤、硬化剤などを加え、60〜80℃で15〜90分間解砕、混合する。このようにして得られた湿潤状態の含浸物を80から120℃の乾燥機で15〜60分、95〜120℃で10〜30分乾燥し、メラミン樹脂の反応度をBステージまで進めた乾燥品を得ることができる。
An example of the preparation method of the melamine resin molding material using the above components is shown.
In obtaining the molding material, first, a dried melamine resin was prepared as follows. By reacting at a molar ratio of formaldehyde to melamine of 1.2 to 3 under an alkali catalyst at a reaction temperature of 65 to 98 ° C. and a reaction time of 15 to 120 minutes, melamine resin syrup is obtained, and this melamine resin syrup is transferred to a kneader. While stirring, sheet pulp, sheet-shaped kenaf, powdered kenaf, cotton powder, glass fiber, synthetic resin fiber and the like, a release agent, a curing agent, and the like are added, and pulverized and mixed at 60 to 80 ° C. for 15 to 90 minutes. The wet impregnated material thus obtained was dried at 80 to 120 ° C. for 15 to 60 minutes and at 95 to 120 ° C. for 10 to 30 minutes, and the melamine resin reactivity was advanced to the B stage. Goods can be obtained.

他方、メラミン固形樹脂は、メラミンに対するホルムアルデヒドのモル比1.2〜3でアルカリ触媒下、反応温度80〜100℃、反応時間20〜150分の反応させた後、反応溶液を真空ニーダーや、薄膜脱水装置を用いて、脱水してメラミン固形樹脂を得ることができる。これら、メラミン樹脂乾燥品、メラミン固形樹脂をボールミルで4〜12時間粉砕した後、無機充填材として、酸化チタン、硫酸バリウムを必須成分として配合し、硬化剤、離型剤、着色剤を配合し、30分〜1時間混合すると粉末成形材料を得ることができ、この粉末成形材料を85〜110℃に加熱したロールや1軸または2軸連続混練造粒装置にかけ溶融、混合し、吐出物を冷却、粉砕し粒状のメラミン樹脂成形材料を得ることができる。   On the other hand, the melamine solid resin is reacted in a molar ratio of formaldehyde to melamine of 1.2 to 3 in an alkaline catalyst under a reaction temperature of 80 to 100 ° C. and a reaction time of 20 to 150 minutes. Using a dehydrator, the melamine solid resin can be obtained by dehydration. After these melamine resin dried products and melamine solid resin are pulverized with a ball mill for 4 to 12 hours, titanium oxide and barium sulfate are blended as essential components as inorganic fillers, and curing agents, mold release agents and colorants are blended. When mixed for 30 minutes to 1 hour, a powder molding material can be obtained. This powder molding material is melted and mixed in a roll heated to 85 to 110 ° C. or a uniaxial or biaxial continuous kneading granulator, and mixed. By cooling and pulverizing, a granular melamine resin molding material can be obtained.

この成形材料を用いた成形品の作製方法の一例を挙げると、例えば、得られた粉状または、粒状の成形材料を圧縮成形プレスを用いて、成形圧力0.8〜20MPa、金型温度140〜180℃、20秒〜10分の成形時間で金型に応じた食器を、温風加熱でも変色しにくいメラミン食器を製造することができる。   An example of a method for producing a molded product using this molding material is, for example, using a compression molding press for the obtained powdery or granular molding material, a molding pressure of 0.8 to 20 MPa, a mold temperature of 140. Melting utensils that are difficult to discolor even when heated according to the mold can be produced in a molding time of ˜180 ° C. for 20 seconds to 10 minutes.

酸化チタンを顔料として配合する場合の使用範囲を越えた2.5〜13質量%と大量に用いることで、温風加熱による変色を隠蔽する作用により表面に変色が現れ難くしたものである。この作用は、硫酸バリウム8〜50質量%の組み合わせ配合でメラミン樹脂乾燥品の使用量を減らすことができることから促進される傾向にある。   By using the titanium oxide in a large amount of 2.5 to 13% by mass exceeding the use range when blended as a pigment, discoloration hardly occurs on the surface due to the action of concealing the discoloration caused by heating with hot air. This action tends to be promoted because the amount of dried melamine resin can be reduced with a combination of 8 to 50% by mass of barium sulfate.

すなわち、酸化チタンが2.5質量%未満では、隠蔽効果が少なく変色が見受けられる。酸化チタンが13質量%を越えると材料の混練時に機械装置によるスレ込みが発生し成形品外観に汚染を発現してしまう。硫酸バリウムが、8質量%未満では前記促進効果がほとんどなく、50質量%を越えると成形品比重を大きくするので好ましくない。   That is, when the titanium oxide is less than 2.5% by mass, the hiding effect is small and discoloration is observed. When titanium oxide exceeds 13% by mass, threading by a mechanical device occurs when the material is kneaded, and contamination of the appearance of the molded product is developed. If the amount of barium sulfate is less than 8% by mass, the above-mentioned accelerating effect is hardly obtained.

以下、本発明を実施例を挙げて詳細に説明する。
(実施例1〜8、比較例1〜3)
メラミン樹脂乾燥品、メラミン固形樹脂を、ボールミルにより10時間処理して粉砕した。これと表1の配合成分に示す他の成分を所定の割合で配合し、ボールミルにて1時間混合し、得られた粉砕品を、ニーダにて加熱・混練した。次いで、これを冷却固化した後、粉砕機で粉砕して粒状の成形材料を得た。得られた成形材料を用いて、成形性、物性を評価した結果を表1の下半分に示した。なお、表1中における松下電工(株)製の詳細、及び評価試験条件の詳細は、次の通りである。
Hereinafter, the present invention will be described in detail with reference to examples.
(Examples 1-8, Comparative Examples 1-3)
The dried melamine resin and the melamine solid resin were processed by a ball mill for 10 hours and pulverized. This and other components shown in Table 1 were mixed at a predetermined ratio, mixed for 1 hour with a ball mill, and the resulting pulverized product was heated and kneaded with a kneader. Next, this was cooled and solidified, and then pulverized by a pulverizer to obtain a granular molding material. The results of evaluating moldability and physical properties using the obtained molding material are shown in the lower half of Table 1. The details of Matsushita Electric Works, Ltd. in Table 1 and the details of the evaluation test conditions are as follows.

メラミン樹脂乾燥品:メラミン(日産化学工業社製)2520gと37%ホルマリン2600gをNaOH触媒下で反応温度85℃、反応時間60分で反応させることで、メラミン樹脂シラップを得た。このメラミン樹脂シラップ3kgをニーダーに移し、攪拌しながらシートパルプ720g、ステアリン酸亜鉛9g、硬化剤として無水フタル酸1gを加え、70℃で40分間解砕、混合する。このようにして得られた湿潤状態の含浸物を90℃の乾燥機で20分、105℃で15分乾燥し、メラミン樹脂の反応度をBステージまで進めた乾燥品を得た。   Melamine resin dried product: Melamine resin syrup was obtained by reacting 2520 g of melamine (manufactured by Nissan Chemical Industries) and 2600 g of 37% formalin under a NaOH catalyst at a reaction temperature of 85 ° C. and a reaction time of 60 minutes. Transfer 3 kg of this melamine resin syrup to a kneader, add 720 g of sheet pulp, 9 g of zinc stearate and 1 g of phthalic anhydride as a curing agent while stirring, crush and mix at 70 ° C. for 40 minutes. The wet impregnated material thus obtained was dried with a 90 ° C. dryer for 20 minutes and at 105 ° C. for 15 minutes to obtain a dried product in which the reactivity of the melamine resin was advanced to the B stage.

メラミン固形樹脂:メラミン固形樹脂は、次の様にして調製した。メラミン2400gに対してホルムアルデヒドを40%ホルマリンで2157g、NaOHを0.25g加え、95℃で50分間付加、縮合反応させた後、8kPa減圧して200℃蒸気で加熱することによって減圧加熱脱水して固形状のメラミン樹脂を得た。   Melamine solid resin: The melamine solid resin was prepared as follows. Add 2157 g of formaldehyde with 40% formalin and 0.25 g of NaOH to 2400 g of melamine, add it at 95 ° C. for 50 minutes, conduct a condensation reaction, depressurize by 8 kPa and heat with 200 ° C. steam to dehydrate under reduced pressure. A solid melamine resin was obtained.

メラミン樹脂硬化物粉末:この乾燥品をボールミルで10時間粉砕した後、無水フタル酸0.9g、ステアリン酸亜鉛12g、ステアリン酸アマイド1.5gは配合し、1時間粉砕混合すると粉末成形材料をえることができ、この粉末成形材料を100℃に加熱した一軸混練造粒装置にかけ溶融、混合し、吐出物を冷却、粉砕し粒状の成形材料を得た。
この粒状成形材料を37トンプレス直圧成形機で、成形した成形品を粉砕して、メラミン樹脂硬化物粉末を得た。
Melamine resin cured product powder: This dried product is pulverized with a ball mill for 10 hours, and then 0.9 g of phthalic anhydride, 12 g of zinc stearate and 1.5 g of stearic acid amide are blended and pulverized and mixed for 1 hour to obtain a powder molding material. The powder molding material was melted and mixed in a uniaxial kneading granulator heated to 100 ° C., and the discharged material was cooled and pulverized to obtain a granular molding material.
The granular molded material was pulverized with a 37-ton press direct pressure molding machine to obtain a cured melamine resin powder.

・評価試験条件
(成形性試験)
1.円盤延び試験
成形圧力10MPa、金型温度170℃の直圧成形プレスを使用し、試料5gで円盤を成形し、その広がりを測定し、平均値を求めた。
2.溶融硬化時間測定
コップ状金型を用いて、成形材料の硬化具合をコップがかすれず且つ、膨れず成形できる最小硬化時間で測定した。
(物性試験)
3.耐熱変色性
75×120mm、厚み3mmの試験片を、(A)120℃、500時間処理後、(B)160℃、168時間処理後の変色をΔEにて測定。
4.耐汚染性
75×120mm、厚み3mmの試験片を、濃度3%のコーヒー溶液に10時間煮沸処理した後のΔEを測定。
5.耐ヒートサイクル性
直径200mmの皿を−20℃に30分処理、次に140℃、30分処理を1サイクルとして、500サイクル繰り返した後、クラック発生の有を×、無を○で判定。
6.耐熱曲げ強度保持率
JISK6911の曲げ試験において、120℃、500時間加熱処理後の値を処理しない試験片の値で割った値。
7.比重(JISK6911)
・ Evaluation test conditions (formability test)
1. Disc Elongation Test Using a direct pressure molding press with a molding pressure of 10 MPa and a mold temperature of 170 ° C., a disc was molded with a sample of 5 g, its spread was measured, and an average value was obtained.
2. Measurement of Melt Curing Time Using a cup-shaped mold, the degree of curing of the molding material was measured by the minimum curing time that can be molded without fading and swelling.
(Physical property test)
3. Thermal discoloration 75 × 120 mm, 3 mm thick test piece was measured for (A) 120 ° C. for 500 hours, and (B) 160 ° C. for 168 hours after discoloration measured by ΔE.
4). Contamination resistance Measure ΔE after boiling a test piece of 75 × 120 mm and a thickness of 3 mm in a coffee solution with a concentration of 3% for 10 hours.
5). Heat cycle resistance A dish having a diameter of 200 mm was treated at −20 ° C. for 30 minutes, then treated at 140 ° C. for 30 minutes as one cycle.
6). Heat-resistant bending strength retention value In the bending test of JISK6911, the value obtained by dividing the value after heat treatment at 120 ° C. for 500 hours by the value of the untreated specimen.
7). Specific gravity (JISK6911)

Figure 2005132863
Figure 2005132863

表1に示す結果から明らかなように、各実施例及び比較例を比べると、実施例の方が比較例の場合よりも、耐熱変色性が向上することが確認できた。
すなわち、メラミン樹脂に酸化チタンと硫酸バリウムを併使用した実施例1〜8と酸化チタンを使用してもその量が少ない比較例1〜3では耐熱変色性は良くない。硫酸バリウムを多く使用した比較例3では、さらに比重が大きくなり、耐汚染性も悪いことが確認できた。
As is clear from the results shown in Table 1, it was confirmed that the heat resistance discoloration was improved in the example compared to the comparative example when each example and the comparative example were compared.
That is, even in Examples 1 to 8 in which titanium oxide and barium sulfate are used in combination with the melamine resin and in Comparative Examples 1 to 3 in which the amount is small, the heat discoloration is not good. In Comparative Example 3 where a large amount of barium sulfate was used, it was confirmed that the specific gravity was further increased and the contamination resistance was poor.

Claims (4)

メラミン樹脂成形材料において、メラミン樹脂と含有する無機充填材9〜53質量%の内、酸化チタンを2.5〜13質量%、硫酸バリウムを8〜50質量%の範囲で含むことを特徴とする食器用メラミン樹脂成形材料。   The melamine resin molding material is characterized in that it contains 2.5 to 13% by mass of titanium oxide and 8 to 50% by mass of barium sulfate in 9 to 53% by mass of the inorganic filler containing melamine resin. Melamine resin molding material for tableware. メラミン樹脂硬化物粉末又は及びPET樹脂粉末を9〜40質量%の範囲で含有することを特徴とする請求項1に記載の食器用メラミン樹脂成形材料。   2. The melamine resin molding material for tableware according to claim 1, comprising melamine resin cured product powder or PET resin powder in a range of 9 to 40% by mass. ガラス繊維を4〜10質量%の範囲で含有することを特徴とする請求項1乃至2いずれかに記載の食器用メラミン樹脂成形材料。   3. The melamine resin molding material for tableware according to claim 1, comprising glass fiber in a range of 4 to 10% by mass. 請求項1乃至3のいずれかに記載の食器用メラミン樹脂成形材料によって成形加工されたメラミン樹脂製食器。   A melamine resin tableware molded by the melamine resin molding material for tableware according to any one of claims 1 to 3.
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010189607A (en) * 2009-02-20 2010-09-02 Panasonic Electric Works Co Ltd Melamine resin molding material
JP2010195871A (en) * 2009-02-23 2010-09-09 Kokusai Kako Kk Reproduced melamine resin material for compression molding, reproduced melamine resin molded article, method for manufacturing the same, and tableware
KR101254296B1 (en) * 2012-11-22 2013-04-12 동화홀딩스 주식회사 Manufacturing method of melamine resin having excellent gloss and adhesion and melamine resin using the manufacturing method
JP5801510B1 (en) * 2015-06-17 2015-10-28 ヤマト化工株式会社 Melamine resin tableware
CN107383773A (en) * 2017-09-07 2017-11-24 广州简米餐具有限公司 Method for preparing mixture of high-molecular high-density melamine powder and particles

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010189607A (en) * 2009-02-20 2010-09-02 Panasonic Electric Works Co Ltd Melamine resin molding material
JP2010195871A (en) * 2009-02-23 2010-09-09 Kokusai Kako Kk Reproduced melamine resin material for compression molding, reproduced melamine resin molded article, method for manufacturing the same, and tableware
KR101254296B1 (en) * 2012-11-22 2013-04-12 동화홀딩스 주식회사 Manufacturing method of melamine resin having excellent gloss and adhesion and melamine resin using the manufacturing method
JP5801510B1 (en) * 2015-06-17 2015-10-28 ヤマト化工株式会社 Melamine resin tableware
CN107383773A (en) * 2017-09-07 2017-11-24 广州简米餐具有限公司 Method for preparing mixture of high-molecular high-density melamine powder and particles

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